package com.hui.utils;

import com.hui.auth.entity.AuthUser;

import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * 对象--实体--json工具包
 * Created by LiaoYunHui on 2017/10/12/012.
 */
public class ObjAnalysisUtil {

    /**
     * 将一个 JavaBean 对象转化为一个  Map
     *
     * @param obj
     * @return
     */
    @Deprecated
    public static Map convertObjToMap(Object obj) {
        Map<String, Object> reMap = new HashMap<String, Object>();
        if (obj == null)
            return null;
        Field[] fields = obj.getClass().getDeclaredFields();
        try {
            for (int i = 0; i < fields.length; i++) {
                try {
                    Field f = obj.getClass().getDeclaredField(fields[i].getName());
                    f.setAccessible(true);
                    Object o = f.get(obj);
                    reMap.put(fields[i].getName(), o);
                } catch (NoSuchFieldException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IllegalArgumentException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IllegalAccessException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        } catch (SecurityException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return reMap;
    }

    /**
     * 将一个 JavaBean 对象转化为一个  Map
     *
     * @param bean 要转化的JavaBean 对象
     * @return 转化出来的  Map 对象
     * @throws IntrospectionException    如果分析类属性失败
     * @throws IllegalAccessException    如果实例化 JavaBean 失败
     * @throws InvocationTargetException 如果调用属性的 setter 方法失败
     */
    @SuppressWarnings({"rawtypes", "unchecked"})
    public static Map convertBean(Object bean) throws IntrospectionException, IllegalAccessException, InvocationTargetException {
        Class type = bean.getClass();
        Map returnMap = new HashMap();
        BeanInfo beanInfo = Introspector.getBeanInfo(type);
        PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
        for (int i = 0; i < propertyDescriptors.length; i++) {
            PropertyDescriptor descriptor = propertyDescriptors[i];
            String propertyName = descriptor.getName();
            if (!propertyName.equals("class")) {
                Method readMethod = descriptor.getReadMethod();
                Object result = readMethod.invoke(bean, new Object[0]);
                if (result != null) {
                    returnMap.put(propertyName, result);
                } else {
                    returnMap.put(propertyName, "");
                }
            }
        }
        return returnMap;
    }

    /**
     * 将一个 Map 对象转化为一个 JavaBean
     *
     * @param type 要转化的类型
     * @param map  包含属性值的 map
     * @return 转化出来的 JavaBean 对象
     * @throws IntrospectionException    如果分析类属性失败
     * @throws IllegalAccessException    如果实例化 JavaBean 失败
     * @throws InstantiationException    如果实例化 JavaBean 失败
     * @throws InvocationTargetException 如果调用属性的 setter 方法失败
     */
    @SuppressWarnings("rawtypes")
    public static Object convertMap(Class type, Map map) throws IntrospectionException, IllegalAccessException, InstantiationException, InvocationTargetException {
        BeanInfo beanInfo = Introspector.getBeanInfo(type); // 获取类属性
        Object obj = type.newInstance(); // 创建 JavaBean 对象
        // 给 JavaBean 对象的属性赋值
        PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
        for (int i = 0; i < propertyDescriptors.length; i++) {
            PropertyDescriptor descriptor = propertyDescriptors[i];
            String propertyName = descriptor.getName();
            if (map.containsKey(propertyName)) {
                // 下面一句可以 try 起来，这样当一个属性赋值失败的时候就不会影响其他属性赋值。
                try {
                    Object value = map.get(propertyName);
                    Object[] args = new Object[1];
                    args[0] = value;
                    descriptor.getWriteMethod().invoke(obj, args);
                } catch (Exception e) {
                    System.out.println("属性赋值异常:" + propertyName);
                }
            }
        }
        return obj;
    }

    /**
     * beanList转化为mapList
     *
     * @param objList
     * @return
     * @throws IllegalAccessException
     * @throws IntrospectionException
     * @throws InvocationTargetException
     */
    public static List<Map> beanListToMapList(List objList) throws IllegalAccessException, IntrospectionException, InvocationTargetException {
        List<Map> maps = new ArrayList<>();
        for (Object o : objList) {
            Map map = convertBean(o);
            maps.add(map);
        }
        return maps;
    }

//    public static void main(String[] args) throws InvocationTargetException, IntrospectionException, InstantiationException, IllegalAccessException {
////        ExcelUser a = new ExcelUser();
////        a.setPassword("123456");
////        a.setUserName("王成");
////        Map m = convertObjToMap(a);
////        System.out.println(m);
//
//        Map map = new HashMap();
//        map.put("userName", "aaa");
//        ExcelUser user = (ExcelUser) ObjAnalysisUtil.convertMap(ExcelUser.class, map);
//        System.out.println(user.toString());
//    }
}